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题名: On the Transition of the Galaxy Quenching Mode at 0.5 < z < 1 in CANDELS
作者: Liu, F. S.; Jia, Meng; Yesuf, Hassen M.; Faber, S. M.; Koo, David C.; Guo, Yicheng; Bell, Eric F.; Jiang, Dongfei; Wang, Weichen; Koekemoer, Anton M.; Zheng, Xianzhong; Fang, Jerome J.; Barro, Guillermo; Perez-Gonzalez, Pablo G.; Dekel, Avishai; Kocevski, Dale; Hathi, Nimish P.; Croton, Darren; Huertas-Company, M.; Meng, Xianmin; Tong, Wei; Liu, Lu
刊名: ASTROPHYSICAL JOURNAL
出版日期: 2018
卷号: 860, 期号:1, 页码:60
英文摘要: We investigate the galaxy quenching process at intermediate redshift using a sample of similar to 4400 galaxies with M-* >10(9) M-circle dot between redshift 0.5 and 1.0 in all five CANDELS fields. We divide this sample, using the integrated specific star formation rate (sSFR), into four subgroups: star-forming galaxies (SFGs) above and below the ridge of the star-forming main sequence (SFMS), transition galaxies and quiescent galaxies. We study their UVI (U -V versus V-I) color gradients to infer their sSFR gradients out to twice effective radii. We show that on average both star-forming and transition galaxies at all masses are not fully quenched at any radii, whereas quiescent galaxies are fully quenched at all radii. We find that at low masses (M-* = 10(9) - 10(10) M-circle dot) SFGs both above and below the SFMS ridge generally have flat sSFR profiles, whereas the transition galaxies at the same masses generally have sSFRs that are more suppressed in their outskirts. In contrast, at high masses (M-* > 10(10.5) M-circle dot), SFGs above and below the SFMS ridge and transition galaxies generally have varying degrees of more centrally suppressed sSFRs relative to their outskirts. These findings indicate that at z similar to 0.5-1.0 the main galaxy quenching mode depends on its already formed stellar mass, exhibiting a transition from "the outside-in" at M*<= 10(10) M-circle dot to "the inside-out" at M-* > 10(10.5) M-circle dot. In other words, our findings support that internal processes dominate the quenching of massive galaxies, whereas external processes dominate the quenching of low-mass galaxies.
语种: 英语
WOS记录号: WOS:000435102000010
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/18026
Appears in Collections:南极天文中心_期刊论文

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